Tuning What is a good FPS for a .25 Taipan Veteran long w/JSB exact king?

[mikes383]

Hello guys. Playing with the chronograph indoors and found my Veteran was shooting the JSB 25.34g at 960-970's fps. I backed HST down which dropped fps to 890-895. Is there a recommended or target FPS for these pellets? I did shoot down until I significantly dropped fps and it was around 110 bar. Forgive me, I'm new to this and still learning. Thanks!

 

[wyshadow]

IMO depends on what you want to do with your gun. For hunting or target shooting, 960 fps is way to fast for .25 cal pellet but I've read some have shot at that speed in .177 and still have great accuracy. I normally tune all my guns around 880 fps for an all around speed but if I know one gun will only used for hunting, I shoot for 910 to 915 fps. I'm ok with sacrificing a little bit of accuracy for a flatter trajectory. If I have a gun just for target shooting, I tune the gun about 850 to 860 fps. A loopy trajectory is ok if you know exact distances for each target.

 

[Redick]

+1

 

[JohnnyPDX]

PM'd you 

 

[mikes383]

IMO depends on what you want to do with your gun. For hunting or target shooting, 960 fps is way to fast for .25 cal pellet but I've read some have shot at that speed in .177 and still have great accuracy. I normally tune all my guns around 880 fps for an all around speed but if I know one gun will only used for hunting, I shoot for 910 to 915 fps. I'm ok with sacrificing a little bit of accuracy for a flatter trajectory. If I have a gun just for target shooting, I tune the gun about 850 to 860 fps. A loopy trajectory is ok if you know exact distances for each target.

I like paper and targets but there's this one woodchuck that keeps eluding me....... I will try the fps you mentioned and see how the pellet likes it. Thanks!

 

[RENVAL]

I use my 25 long for pesting mostly, I’ve tried the jsb king also the MK1 and Mk2, the Vet shots them very well but I would suggest to try the NSA 29.5g @935fps, man they are super accurate and hit hard, specially squirrels, since i start using this NSA I haven’t had any runners, they all DRT!



Renz

 

[mikes383]

I use my 25 long for pesting mostly, I’ve tried the jsb king also the MK1 and Mk2, the Vet shots them very well but I would suggest to try the NSA 29.5g @935fps, man they are super accurate and hit hard, specially squirrels, since i start using this NSA I haven’t had any runners, they all DRT!



Renz

Thanks! I'll look into those! I must add, I don't think there is anything wrong with my gun, in fact it's very nice, I'm just looking to learn more about it. I want to know what it likes and does not like so I can get the most out of it along with knowing what changes will do what etc. 

 

[RENVAL]

A while back I set my Cricket @ 880-890 for the 25g and i could tell it was a good speed for accuracy and shot count, but later i up the speed to 915fps and I noticed a slight improvement @50 yards but the groups @100 improved considerably.

the Veterans are great guns, super reliable and easy to work on, just take your time and try different pellets, one thing for sure is your gun might not like what my gun likes, even if they have the same settings.

Renz

 

[Jlacouturec]

veteran long is not designed for 25.4 grainers, its designed for 34gr king heavies mk2 @890-910fps.... you can decrease power by adjusting hammer spring but consistency will go away because of the de unbalance between reg pressure and hammer spring tension

 

[Jlacouturec]

you can also decrease reg pressure and tune it for 25.4gr.... two friends of mine bought veteran long and both of them came with the reg 145ish.... older models i remember reg came at 125 straight from the factory

 

[mikes383]

Thank you for the info. I have a tin of mk1 but not the MK2. I will try them possibly this weekend if the weather cooperates. I’d still like to find a regulator tester for the TaiPan, I would even have one custom-made if anyone knows a machinist here familiar with building them.

 

[Jlacouturec]

I realized the regulator pressure was at 145ish on both veterans because I chrony them and the speed on both of them began to fall at that pressure....

I filled them up to 245bar and i got 32 regulated shots at 900-905fps. I also did some accuracy tests and the MK2’s performed better than the MK1’s in both rifles.